How to Change IP Address on Unix?

Last Updated February 24, 2007

Issue

How to Change IP Address on Unix?

Solution

Answer 1

By far the cleanest way of doing this is by running usr/sbin/sys-unconfig

This will let you re-enter all those install type questions: hostname, IP address, nameservices etc,etc. This will also require a reboot.

Answer 2

You can change the IP address of your UNIX server with the following command:

#ifconfig lo0:0 inet <ip-address> netmask<subnetmask> broadcast<broadcast addr> down

#ifconfig le0 up

Answer 3

You need to make changes in three files:

• /etc/hosts (For new IP address of server)
• /etc/defaultrouter (For new router IP address)
• /etc/netmasks (For new N/W number)

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